HI, If you can`t get into Windows at all, the only thing I can think of is this.
Reboot and while computer is booting up press F8 repeatedly and you will get into Safe Mode. If you miss it and end up at logon, just reboot and try again, Once in Safe Mode find your Account and I think you will be able to change your password.
Write it down and make a Password Reset Disk
Instructions for that here
http://8help.ohio-state.edu/747.html
Hope this works.
Elaine